<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <script language="javascript">
    var Base64 = {
     
	    // private property
	    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
     
	    // public method for encoding
	    encode : function (input) {
		    var output = "";
		    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		    var i = 0;
     
		    input = Base64._utf8_encode(input);
     
		    while (i < input.length) {
     
			    chr1 = input.charCodeAt(i++);
			    chr2 = input.charCodeAt(i++);
			    chr3 = input.charCodeAt(i++);
     
			    enc1 = chr1 >> 2;
			    enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			    enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			    enc4 = chr3 & 63;
     
			    if (isNaN(chr2)) {
				    enc3 = enc4 = 64;
			    } else if (isNaN(chr3)) {
				    enc4 = 64;
			    }
     
			    output = output +
			    this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			    this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
     
		    }
     
		    return output;
	    },
     
	    // public method for decoding
	    decode : function (input) {
		    var output = "";
		    var chr1, chr2, chr3;
		    var enc1, enc2, enc3, enc4;
		    var i = 0;
     
		    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
     
		    while (i < input.length) {
     
			    enc1 = this._keyStr.indexOf(input.charAt(i++));
			    enc2 = this._keyStr.indexOf(input.charAt(i++));
			    enc3 = this._keyStr.indexOf(input.charAt(i++));
			    enc4 = this._keyStr.indexOf(input.charAt(i++));
     
			    chr1 = (enc1 << 2) | (enc2 >> 4);
			    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			    chr3 = ((enc3 & 3) << 6) | enc4;
     
			    output = output + String.fromCharCode(chr1);
     
			    if (enc3 != 64) {
				    output = output + String.fromCharCode(chr2);
			    }
			    if (enc4 != 64) {
				    output = output + String.fromCharCode(chr3);
			    }
     
		    }
     
		    output = Base64._utf8_decode(output);
     
		    return output;
     
	    },
     
	    // private method for UTF-8 encoding
	    _utf8_encode : function (string) {
		    string = string.replace(/\r\n/g,"\n");
		    var utftext = "";
     
		    for (var n = 0; n < string.length; n++) {
     
			    var c = string.charCodeAt(n);
     
			    if (c < 128) {
				    utftext += String.fromCharCode(c);
			    }
			    else if((c > 127) && (c < 2048)) {
				    utftext += String.fromCharCode((c >> 6) | 192);
				    utftext += String.fromCharCode((c & 63) | 128);
			    }
			    else {
				    utftext += String.fromCharCode((c >> 12) | 224);
				    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				    utftext += String.fromCharCode((c & 63) | 128);
			    }
     
		    }
     
		    return utftext;
	    },
     
	    // private method for UTF-8 decoding
	    _utf8_decode : function (utftext) {
		    var string = "";
		    var i = 0;
		    var c = c1 = c2 = 0;
     
		    while ( i < utftext.length ) {
     
			    c = utftext.charCodeAt(i);
     
			    if (c < 128) {
				    string += String.fromCharCode(c);
				    i++;
			    }
			    else if((c > 191) && (c < 224)) {
				    c2 = utftext.charCodeAt(i+1);
				    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				    i += 2;
			    }
			    else {
				    c2 = utftext.charCodeAt(i+1);
				    c3 = utftext.charCodeAt(i+2);
				    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				    i += 3;
			    }
     
		    }
     
		    return string;
	    }
     
    }
    var orig = "test1"
    var enced = Base64.encode(orig);
    var deced = Base64.decode(enced);
    alert(orig + " -> " + enced + " -> " + deced);
    </script>

</head>
<body>
    <form action="https://www.google.com/accounts/ServiceLoginAuth">
        <input type="hidden" name="continue" value="http://mail.google.com/mail/#inbox" />
        <input type="hidden" name="Email" value="xavi.viladrosa" />
        <input type="hidden" name="Passwd" value="" />
        <input type="submit" />
    </form>
</body>
</html>
